Water Rocket Forum

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A water rocket is a type of model rocket using water as its reaction mass. The pressure vessel (the engine of the rocket) is constructed from thin plastic or other non metallic materials (usually a used plastic soft drink bottle) weighing 1,500 grams or less. The water is forced out by compressed air. It is an example of Newton's third law of motion.

Both t12's have not ruptured yet, but they also have alum tape reinforcement, and they have only had a few launches. I am having problems with upper..."salad dressing" caps leaking after a few pressurization events.

The o-ring still has a release point beyond 160 for much of our FTC rockets, and maybe beyond our 200 psi hand pump, poly tubing, PVC, hot melt, and how knows what else. We are getting a handle on how much to partially load some rockets and get a lower pressure release, but a uncontrolled launch moment.

Today we blew up some more rockets. Seems the FTCs with glass tape or alum tape do not like to bond with hot melt or PL with the nozzle bulkheads overlapping the tape. So we will need to rebuild them with the tape only external, but with a few extra passes near the bulkheads, top n bottom.

Looks like we will alter the launcher for swappable launch tubes for a higher pressure o-ring and lower pressure o-ring. I want to keep this first launcher with poly air line as long as possible.

Or we will just make a copper launcher that supports pressure washer hose.,.....